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MUSEUM BULLETIN Nj>* 27 • 
range X, lot 9. 
block A, Black Lake Chrome and Asbestos Company . 
* a r Caribou chrome pit. 
a “ Standard A sbestos Company. 
“ * Chrome and A $estos Company , Caribou chrome pit 
“ * Standard Asbestos Company. 
“ * B/flcfe LaJfee Chrome and Asbestos Company , Caribou chrome pit. 
block B, lot 28, Union mine, 
range B, lot 26, Ward and Ross. 
“ A, lot 16, Hall chrome pit ( Thetford quarry ), Dominion Mines 
and Quarries, 
range A, lot 17. 
range IV, lot 25, American chrome pit. 
“ XIII, lot 5, Indian Reserve. 
* III, lot 25. 
“ II, lot 25, Montreal chrome pit (now Black Lake quarry). 
Dominion Mines and Quarries. 
* XIII, lot 2, R. H. Gardiner. 
“ IV, lot 25, American chrome pit. 
ROCKS OF THE SERPENTINE BELT. 
As stated above, the serpentine belt consists of a series of igneous 
rocks which are, in very large measure, basic in composition. In Black 
Lake area, the series includes peridotite (partially altered to serpentine), 
pyroxenite, gabbro, diabase, porphyrite, granite, and aplite; all these 
various types are believed to have originated by progressive differen- 
tiation from a single parent magma, although the granite and aplite 
occur most frequently as dykes, etc., cutting the more basic rocks of the 
complex. 
The following chemical analyses (made by M. F. Connor and repro- 
duced from Dresser’s report) show the composition of typical specimens 
of the more important varieties : 
Rock Analyses. 
1 
Peridotite 
2 
Serpentine 
3 
Pyroxenite 
4 
Diabase 
SiO*. . . ......... ........ 
38 >16 
40*08 
46*30 
42*96 
TiOj. , . . . 
none 
none 
trace 
0*66 
AIjO*. 
0-63 
2-11 
2*58 
17*45 
Fe"0*. , ..... ... . . ... . . , 
3-32 
M3 
3*45 
2*29 
FeO. ......... ................. 
4-76 
1-70 
3*57 
11*04 
9*77 
MgO. ..... ........ 
41-84 
*37*90 
23-18 
CaO. ........... .......... 
0*68 
0*20 
15*20 
6*80 
/KiO \ 
0-20 
0*10 
0*15 
1*51 
\Na s O P * * * * 
H S Q — 110* 
0-47 
1*35 
0*66 
1*93 
0*47 
H,O+110°. .... . ... ... 
9-63 
13*89 
4*77 
4*75 
Total. ................... 
99-69 
98*76 
99*86 
99*63 
*MgO probably low. 
1 Near Black Lake station. 
2 Near Black Lake station. 
3 Gart'hby, range II, lot 40. 
4 Garthby, range II, lot 40. 
